A light with a wavelength of 500 nm (red color) travels from a laser to a photocell in 15 ns. When a thin glass slab is placed normally in front of the photocell it takes the light 18 ns to travel from the laser to the photocell? When the Laser beam passes through the glass slab it changes to blue in color (λ  = 660 nm). What is the thickness of the glass slab?

You are in a room lit only by blue light. A chair in that room looks black to you. (Your eyes see red + green light as yellow; your eyes see red+ blue light as magenta; your eyes see green and blue light as cyan)    a. What colors of light is the chair reflecting in the blue room? What colors of light is the chair absorbing in that room? Explain.   b. You then move the chair out into the sunlight. What possible colors could the chair be in the sunlight? Explain.

A beam of initially unpolarized light passes through a sequence of three ideal polarizers. The angle p12 between the axes of the first and second polarizers is 23.9°, and the angle p23 between the axes of the second and third polarizers is 58.7°. P12 P23 What is the ratio of the intensity I3 of light emerging from the third polarizer to the intensity Io of light incident on the first polarizer? I3 0.2256 Io Incorrect

1. A radio telescope measures a plane wave with a flux density of 5 Jy along theX polarisation and 2.5 Jy along the Y polarisation. The waves are determinedto have a phase difference of 30◦. Calculate the Stokes parameters.

A ray of light consisting of blue light (wavelength 480 nm) and red light (wavelength 670 nm) is incident on a thick piece of glass at 80°.  What is the angular separation between the refracted red and refracted blue beams while they are in the glass?  (The respective indices of refraction for the blue light and the red light are 1.4636 and 1.4561.) 0.27° 0.33° 0.36° 0.46° 0.54°

A monochromatic beam of light in air has a wavelength of 589 nm in air. it passes through Carbon disulfate (n=1.63) and then through glass (=1.52). what is its wavelength in glass? Group of answer choices 421 nm 388 nm 487 nm 361 nm

A light ray in glass (refractive index 1.57) arrives at the glass-water interface at an angle of 0 = 48° with the normal. The index of refraction of water is 1.33. What is the angle of refraction @ that a refracted ray makes with the normal ? water glass O 42° O 56° O 61° O 20°